Blindstitch sewing-machine.



W. A. MoCOOL. BLINDBTITCH SEWING IACEINE.

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Patented Feb. 7, 1911.

NVENTOR:

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`tain parta in vertice UNITED STATES PATENT @miriamo mul A. loCOOL, 0l' BIAVIB FALLS, PENNYLVANIA, ABIIONOB T0 ACME m8110108 11,0. COHPANY. A CORPORATION 0I PENNSYLVANIA.

BLINDITITCH lEWIN-mlacnnll.

To all whom it nog concern:

Beit known that I, Winnaar A. McCooi, a citiaen o tbe Unit ed States, residing at Beaver Fal s, in the county of Beaver und State of Pennsylvania, li'ave invented or di covered cartelli new and useful improvements in Bliiidstitoli Sewing-Machines, of which the following ia a specification, reference being had therein to the accompanyinhdrawings.

' is invention relates'toblind stitch sew ing machines such for exam le as those shown and described in U. S. stents Nos. 030,000 and 070,553, in which thc needle is caused to paas through a ridge or bend in th e work in euch a inanner that the stitches will be visible only on one side of the work;

invention has for its object to pri 'vide a machine, `of -the class referred to, which will not only afford more rooui beneath the arm which supporta theutiteh-forni- :im mechanism than ia adonled in the manea of the patente above referred to, as

in the machines shown b inv applhuition for U. 8. Letters Patent ed Ma 1000, Serial No. 818,480, biit,`which wil also con- ,tain a positively operated ower feed eoratin with au u per f aa in the inaiinc o mid Paten bio. 070,553, und also -a movable ridge-formin' device, no that eertain disadvantages reau ting vfrom the normally dationarynridge-forming device of aai en ao sas-name:

d t twill vided thil t l reaulrbeing a'ecured by providing a vertically 'i'eci rocating rid formin 'device which wil move upya to force t e work into proper itioiifor the needle to mss or bend thereof, but wil recede rom ita ridge-forming position u fter the lplaint ofthe needle has entered the goods, so at the needle can work better. in its atitch-forniiuqoperation, than would otherwise be possi le, as will hereinafter more la d I ev be' l n e accom n in rawin i uren and 9 are aideisracfthe iig'ilirovd nmehine, looking from opposite sides, with cersection; Fig. 3 isa t view of the same and Fig. 4 is n rear 'view of tbe im roved machine. Figs. 5 and 0 are detai views, partly in section,

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Patented Feb. 7, 19.11.

illustrative of of the mechanism for operating the ridgeforming device. Fig. 7 ia a detail vertical section on line 7-7, Fig. 5, and Fi 8 is a detail Perspective view of the sliding har for lif lng the ridge-former' at euch iititch.

Referring to the drawings, 12 denotes the lower portion of the freine of the machine from which at its rear end, rises'a atandard 18 with which is pivotelly connected, by. a hinge pin 13, a stitching frame comprising a rear portion 15 in which is mounted the# driving shaft 16, said frame also comprising an overhangin erm 17 providing bearings for a rocking aft 17 to the front end of which ia secured the vibrati arm 18 carrying the curved needle 19. 'liga said arm 1'( also aupplcirta the upper feeding device com r prising e feed-dog 20 connected with an arm 21 ivotally mounted in a rocker 22 sup r from aaid overhanging arm 17 an ogerated from an eccentric on the dri-ving s aft through a connecting rod 28. From the-said overh'in in arm 17 ia also supported a looper 2 carrying at ita forward end a longitudinally reci rocatin und rocking looper 25 operated m aai driving iieiftioii. The ntitifh-fohning meclinnimiucoinprining the needle and louper above referred to, is essentially the eamo in ita connruction and operation as the stitch-forming mechanisni of the machines of Patents Noe. 680,000 and 670,558, above mentioned, and need not therefore be herein more fully described' while the mechaniian for opera i the feed do 20 is essentially the same as t of my sait a plication No. 818,480 hereinhefore ref'erredp to. The ivotal mounting of the stitching arm is a so essentially the aanie as ininy said application, although diering shaft through a double crank con i the lower feeding device und" lili slightly in details of construction', andthe forward end'of laid stitching frame may be lifted by pressing down on a hand lever 20 as ii. the machine of my said` application. In order to provide a proger clearance for the work beneath the over ang'iag prin of the machine, and at the same time to roperly operate a lower rotating feeding evice, copereting with an upper f eedmg- 'i device or feed domthc improved machine' a ridge-fortncr-ltl. "lnetalitl nf'havng the ridge-fortner stationarroitli the work op ltiainf; from the front pnrt 'of the hase portion lz.' of tbn' franie of the machine is n work su lmrting tirni or post 27 rigid'and pt'efert'iby fortned integral with sind' baise' portion and to the lo) of which arm is seenredn work-plate t! livotally mounted in the VSaid arin` so tis to be free to have a limited rocking movement. is' n block 2li in whieli'is tnonnted a feed abttft 30 provided at its rear end with: ratchet whee haft having at its forward etid a halllile stnd 33 entering tisocltet. in a feed wheel 34 rigidly connected with n seeond feed wheel 35,-said hall-like portion of aid shaft'being irovided with a pin entering a slot in the trat-named feed wheel so as to be capable of impartingr l. ositiverotatin niovenient to the said rigid y connected titi( i'referalilr integral feed wheels 84 and 3?. l igid with the feed heel 35i-"is it `hall-like stad 5 3?. entering a tioeliot. in a yieldin y ly tnonntedgpont tlti vtowed npwtirdby amsn table coil spring; 3i. l`lie bloek 20. is vteldingly pressed ttpward it its inner end hy a eoil .Opt-ing 1li).

'llie eeding nieeliniitain jnst deseribed is than eiwentiiillvl the saine. as that. eovered by the said Patent No. 679,558. lait. itl operating nieehniiisin.'whieli will now he de-erihed. is esisentiall)- dilferciit front that of the said patent. 'Ihe driving shaft 16 carries an eceentrie whieli is' connected by ntenns of a rod l2 with the reni' end of a lever-t3 pivoted to the hase iortion I2 of the t'ratne of the tnaeliiiie. nn jointed at its forward end lo a hat' -l-t wllieh carries n spring-pressed pnllpawl 45 engaging the ratehet wheel :ll on vthe feeiLslitift, so that. an the said eeeentrie rotates n verticalanovetnent will he itnparted to the anid bnr 44 und to the pawl carried thereby for the piirpime of imparting nn in terntittent rotating' movement to the aid feed shaft and to the feed wheels 34 and 35 t operated therefrom. lt will ih ns he seen ineeliaitisin and inoperative wnnection wit i the driving nlnift ua above referred to. an

t the .snnte'is elainied in in v applieation Serial lill No. 567,162, lili-d Jnne lli. llllth and which is a diriitionof thni application. 'llie presser foot 46, rigidly connected with the orerhanging nrni lt, is provided. no iti the innehities ot the raid intente, with ii longitndh tial .dot 47 throngi 'wliieh' n bend or ridge in the goods throie'h which the needle is to pas in forming blilid stitehing is foreed by 31, said .pregunt iititanlee. eonwti'oeted to have u verti- 'cal reciprouitii-ig morenietit, so that it may -iiiove tip-ward to forni a bend or ridge in thel i'ort, n in the nia ehine ofthe said laletit o. ttlhill. the paid litige-former in. in lli:-

goods throuph which the needle is to para;

ie point of the needle has entered the goods, sneh rid -former willre- :o cede to perniitthe need e to complete lite stiteh-lorniint.' nnivetnent without danger of interference willi the said ridge-former: and by the tno'reineni of the latter away from the needle after the point of the needle has entered the goods the'needle i. subjected to less strain. and its thicker port ion or shank i# not erfinipedfbvv heilt -t'oreedv too close to the snrfaee -of tlie rh e-foriner. In mneliines of the-"kindto w iieli the provient in- '85 eention" ielates,rait'd in which 'theridgrk former in stationary with the work-.stimmi-t. as in the inaehine'of the said Patent' No. tlttt,.o't3. it is'itei'niasary, :in order to :leoni-ella. heet resalta., vthat-the lparts should be ad till 1.,'.1 `ted o that ll`iejta-edle roos .-o elowV to the ridge formertbatil in likelyl to interfere thei'en ith atht lhielier portion of itu shank leonie-t opposite aid ridge-ferrari', und thnrear a groovein`theridge-t'oriner. and whit-h fi-'i roove afterward renders it dillient to perorin perfect blind stitt'hiiig. 'This objection is avoided in the preent eonstrnetion, as 'o also the liability of erniiipin the needle in the goods adjaeent tothe rit ge-foinier, iind loo the Ipi-night.; of the needle diie to sneli erainping. in that the ridpe-fornier is. at

eveeil .-titeli. famed to ret-ei front the path of the needle after the point nl the needle has entered the' goede. 'l`o tlin-l end the IUT ridge-former er ridge-forming device llH i-i atlnehed nl its ends to pino -ltl mounted in suitable aoeltetn in the work-snp tort and whieh pins are. preferably provided at their lower ends with rounded portions or projee- 1'0 tions .'Stl enLJmgt-d bv rains or iiieliiies 5l l'ornied on nrnnt ft2 of n sliding reciprocating T't'ornied har .'itl iolnted atits rear end to a bell-erank lever .'rt having ila fnlernni on a pitt or .-t`nd 55 extending troni a litaeltet titl 'l tft nttaebed to the ii'ork-anpimi-ting artti ,or inst 2. the lower or horizontal arm of nttitl lleranhl lever being jointed to tho vertieitlly' reei imitating fwd-olx-rating bar 44 no that ast ie ,aid bar niovenp and down the said l?" T-fornied slide will he nioied hack and foi'tli. the eanial or ineline-i ."il on the arnet .'rlvof the said bnr 'engage the projeetions nlv the lower end of rond pins ttl tlte ridgeforiner will he lifted to foree tlte "3"' work upward thron h the slot inthe. ire- .-erfoot in the l'orin o ya rid e or beni wbieli will be entered h v the neet le: and. as ahoie stated, as somt as thepoiiit of the needle has enteted said bend or ridge in the worlithe 130 which is separate T-t'ornied slide will retire to permit the said ridge-former to bc depressed by the cnilaprui 57 cncirclin' said pine and' inter- |niscdwbctween anniiliir shoulders on said pins and shoulders afforded b the iframe of ithe machine. 'It' will there ore be understood that the ridge-former .will be lifted at every stitch, and will be held in its lifted sition dui-ingl the feeding operation and or a proper time to enable the point of the needle to enter the work; after which it will retire to enable the needle to com lete its stitch-forming movement; and t e said rid -fornier will then a in rise so that, the wor beneath the feedog 20, and which is directly above said rid -former, may be properly engaged by. ssi feed dog during the feeding movement. The reciprocating hd -foriner therefore cooperates directl wit the upper feed dog, while the fee wheels 34 and 85, between which the said rid -former is arranged, coperete directly wit the preciser-foot which latter presses on the work above said feed-wheels.

By reference to' Fif. 8 of the drawings it willbe eeen that the eed dog 20 is arran ed directly'over the ridge-former 48 which atter serves as a support for the work against the thrust of the feed dog. As shown in Figs. 1 and 2 the feed d has a straight lower serrated face wo ing a ainet a straight or horizontal portion of t upper face (ses Fig. 7) of the ridge former or wcrlwui pci-t. 48; and owing o the coopera tive act on of the feed do% and the ridgeformer or work-support 4 the said feed dog haa a strong grip upon the so that an accurate feeding of the latter is inmired. Thus the feed dix, coperating with the ridge-fumier or wo -support arran directly beneath the said feed do and a ao in co ration with thalower f ing wheels 84 an 85, provides a feeding mechanism by which two plies of which ans being blind-stitchcd will n fed along together with the greatest accuracv and unifonnity, so that anv piickerin of the work owing to uneven feeding of t e two plies of goods, will lia absolutely avoided.

Havin thus described in invention l claim an desire to secure by etten Patent:

l. In a blind-stitch sewing machine, the combination with auihblq stitchfsrming meehaiiilii comprising aineedle of a feeding device for advancing the work, a presserfoot having a longitudinal clot ari wise in the line of the feed of the wo from or independent of said feeding device, the said ri device being `mounted beneath mid presserfoot and a transverse to the direction of the movements of said needle and aerviiig to force the work upward through said ot, and means for positively raising or o ge-forming device whiclLextenda ign ut dge'forming' and for lowering` said ridgeiorming device iit cach stitch.

2. lii n. blind stitch sewing iiiiichinc. the combination with iauitalilc ltitoli-forming mechanism, of n premi' foot, ii ridgc-form ing device mounted liciiciith said premier foot. moans for raising and lowering said i'idgt-t'oriiiingg device iitciich stitch, and a ceding mechanism for iidviincinp'l the work, said feeding iiicchnnisin coinprisin v a reciprocnting u iper feeding device iin( ii rotating lower cedingr device.

3. In a blind-stitch sewing machine, they stitch-forming beneath said prenten,

foot, means for raising and lowering said ridge-forming device at each stitch, and a feedin mechanism for advancing the work, said ceding mechanism com rising -s reciprocating u per feeding device and e rotating lower ceding device comprising two yieldingly mounted feed wheels arranged on opposite aides of said ritlgc-torming evcc.

l5. In e blind-stitch sewing mac ine, the combination with suitable stitch-forming mechanism, of a presser-foot, a ridge-form ing device mounted beneath said premerfoot, nieanii for raising and lowering said rid 'ii-forming device at each stitch, and a freding'mechanism for advancing the work, said feeding mechanism comprising a reciprocating upper feedin device arts directly over said rid orming device, and a rotati lower ing device comprising two yiel ingly mounted feed wheels arranged on opposite sides of said ridge-forming device.

6. In a blind-stitch sewing machine, the combination with suitable stitch-forming devices, of a premier-foot rovided with an opening or recess, a ridgeorming device beneath said opening or receaa, means for raieing and lowering said ridge-formin s t each stitch and comprising a ing bai' provided -with cams or inclined, pinsor device supporting said ridge-formilig device and i engaged by said cams or incl' lowerin said pins or poeta after ey have been 1i ted by said cams'or inclines, and means for reciprocating said slid' bar.

7. In a blind stitch rowing mac ine, the combination with stitch-formi devices, of an upper feed dog having a straight serrated lower face, a worksupporting ridge-former rings for iss m'rmmml lirnrlly lmwmh tha mid fm1. dbg I n lvslinwnv whnmof I :mx my signlture, ngndhminp n .lruighl or Imrizmllml lllppvr ilrpl'um-nmof two witmesseh.

uw purliumn uwer ruiming um ingmvm vpc'hwrnlius' with mid urk-supporting "JXAM MLOU lnILm-fomw nml said fm-l clog, mul nwclm- Wma-sum ni-m fm' oycrntin v Ihn swirl fred dog nml 1 hzmn' CALvmc, Imwr rnmhng fem mg IM-me m mnson. f (hr/m. S. Hutu. 

